<template>
  <div class="login_container">
    <div class="login_box">
      <!-- 头像区域 -->
      <div class="avatar_box">
        <img src="../assets/logo.png" alt />
      </div>
      <!-- 登录表单区域 -->
      <el-form
        label-width="0px"
        ref="loginFormRef"
        :model="loginForm"
        :rules="loginFormRules"
        class="login_form"
      >
        <!-- 用户名 -->
        <el-form-item prop="username">
          <el-input
            prefix-icon="iconfont icon-user-fill"
            v-model="loginForm.username"
          ></el-input>
        </el-form-item>
        <!-- 密码 -->
        <el-form-item prop="password">
          <el-input
            show-password
            prefix-icon="iconfont icon-lock-fill"
            v-model="loginForm.password"
          ></el-input>
        </el-form-item>
        <!-- 按钮 -->
        <el-form-item class="btns">
          <el-button type="primary" @click="login">登录</el-button>
          <el-button type="info" @click="resetLoginForm">重置</el-button>
        </el-form-item>
      </el-form>
    </div>
  </div>
</template>

<script>
export default {
  data() {
    return {
      //   登录表单提交对象
      loginForm: {
        username: 'admin',
        password: '123456'
      },
      //   登录表单验证规则
      loginFormRules: {
        username: [
          { required: true, message: '请输入登录名称', trigger: 'blur' },
          {
            min: 3,
            max: 5,
            message: '登录名称长度在 3 到 5 个字符',
            trigger: 'blur'
          }
        ],
        password: [
          { required: true, message: '请输入登录密码', trigger: 'blur' }
        ]
      }
    }
  },
  methods: {
    resetLoginForm() {
      this.$refs.loginFormRef.resetFields()
    },
    login() {
      this.$refs.loginFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.post('login', this.loginForm)
        if (res.meta.status !== 200) return this.$message.error(res.meta.msg)
        this.$message.success(res.meta.msg)
        window.sessionStorage.setItem('token', res.data.token)
        this.$router.push('/home')
        // 1.将登录成功之后的token，保存到客户端 sessionStorage种
        // 1.1 项目种除了登录之外的其他api接口，必须在扽古之后才能访问
        // 1.2token 只营在当前吴总打开期间生效，所有token 保存在sessionStorage种
        // 2.通过编程式导航跳转到后台主页 路由地址/home
      })
    }
  }
}
</script>

<style lang="less" scoped>
.login_container {
  background-color: #2b4b6b;
  height: 100%;
  // color: aliceblue;
}
.login_box {
  width: 450px;
  height: 300px;
  background-color: #fff;
  border-radius: 3px;
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  .avatar_box {
    height: 130px;
    width: 130px;
    // border: 1px solid #fff;
    // border-radius: 50%;
    // box-shadow: 0 0 0 10px #ddd; //box-shadow属性可以设置一个或多个下拉阴影的框。
    position: absolute;
    left: 50%;
    transform: translate(-50%, -50%);
    // background-color: #fff;
    img {
      width: 100%;
      height: 100%;
      // border-radius: 50%;
      // background-color: #eee;
    }
  }

  .login_form {
    position: absolute;
    bottom: 0;
    width: 100%;
    padding: 0 20px;
    box-sizing: border-box; //不懂
    .btns {
      display: flex; //不懂
      justify-content: flex-end;
    }
  }
}
</style>
